I. Design Basis

1. Farm Scale: 5,000-head swine inventory, daily manure production ~50 tons (85% moisture content)
2. Pollution Characteristics:
   • Wastewater: COD 8,000~15,000 mg/L, NH₃-N 500~1,000 mg/L, TP 80~150 mg/L
   • Solid Waste: Manure, biogas residue, dead livestock (requiring harmless treatment)
3. Objectives:
   • Manure resource utilization rate ≥95%, wastewater reuse rate 100%, odor emissions compliant (NH₃ ≤1.5 mg/m³)
   • 

II. Process Flow

Adopts a full-chain resource utilization model of **"solid-liquid separation + anaerobic digestion + biochemical treatment + advanced reuse"**:

1. Pretreatment System

• Solid-Liquid Separation:
  • Screw press separator (screen aperture 0.5 mm), separation efficiency >85%, producing dry manure (65% moisture) → compost feedstock.
• Equalization Tank:
  • Adjust pH to 6.5~7.5, balance water quality/quantity, HRT 6~8 hours.

2. Anaerobic Digestion System

• CSTR Anaerobic Reactor:
  • Volume 1,000 m³, temperature 35~38°C (geothermal heat pump assisted), HRT 15~20 days, COD removal >80%.
  • Biogas yield: 0.3~0.5 m³/kg COD, daily output 1,500~2,000 m³.
  • Biogas applications: Power generation (500 kW generator) or upgraded to bio-CNG (CH₄ ≥95%).

3. Advanced Wastewater Treatment

• AO Biochemical Tank:
  • Anoxic zone (ORP -100~-300 mV) + aerobic zone (DO 2~4 mg/L), simultaneous nitrogen/phosphorus removal.
• Coagulation-Sedimentation:
  • PAC + PAM dosing for enhanced flocculation, inclined plate sedimentation for SS/TP removal.
• Constructed Wetland:
  • Vertical flow wetland (planted with reeds/cattails), HRT 48 hours, further COD/NH₃-N reduction.
• Disinfection & Reuse:
  • Sodium hypochlorite disinfection (residual Cl 0.5 mg/L), reused for barn flushing/green irrigation.

4. Solid Waste Resourceization

• Thermophilic Composting:
  • Dry manure + straw (C/N ratio 25:1) → windrow turner (55°C maintained for 7 days) → organic fertilizer (moisture ≤30%, compliant with NY 525).
• Dead Livestock Treatment:
  • High-temperature rendering (134°C/0.3 MPa, 40 mins) → meat-bone meal (protein feed ingredient).

5. Odor Control System

• Biofilter Tower:
  • Packing layer (sawdust + volcanic rock) inoculated with Thiobacillus/Nitrosomonas, >90% H₂S/NH₃ removal.
• Deodorant Spray:
  • Plant-extract misting covering manure collection and solid waste areas.

III. Key Equipment Specifications

IV. Resource Utilization Benefits

1. Energy Revenue:
   • Biogas power: 3,600 kWh/day (electricity price 0.6 RMB/kWh) → Annual revenue: 780,000 RMB.
2. Fertilizer Revenue:
   • 3,000 tons/year granular organic fertilizer (600 RMB/ton) → Annual revenue: 1.8 million RMB.
3. Water Savings:
   • 180,000 tons/year freshwater replaced (3 RMB/ton) → Annual savings: 540,000 RMB.

V. Operational Cost Estimate

VI. Competitive Advantages

1. Closed-loop Cycle:
   • Manure→biogas→energy→production; wastewater→purification→reuse; solids→fertilizer→cropland.
2. Low-carbon Footprint:
   • Annual CO₂eq reduction ~12,000 tons (biogas replaces coal + reduced fertilizer use).
3. Smart Monitoring:
   • IoT platform for real-time COD/biogas/compost tracking with auto-adjustments.

VII. Key Considerations

1. Pathogen Control:
   • Compost must maintain ≥50°C for 10 days to kill parasites/pathogens.
2. Winter Operation:
   • Anaerobic reactors require insulation/heating to sustain methanogen activity.
3. Contingency:
   • 2,000 m³ emergency pond (anti-seepage) for extreme rainfall/equipment failure.

VIII. Applicable Scenarios

• Intensive swine/cattle/poultry farms
• Agri-ecological parks
• Government-led livestock pollution control projects

Note: Adjustments may be needed for poultry/ruminant manure (e.g., feather removal for chicken manure). Synergy with nearby farmland/orchards ensures integrated farming solutions.

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